[8.x] Use the system index descriptor in the snapshot blob cache cleanup task (#120937) #121053
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…sk (elastic#120937) Clean up of the `.snapshot-blob-cache*` system index is done only on the node that hosts the primary of the shard 0 of that index. When the index is migrated as part of an upgrade test e.g. v7 -> v8, the index is reindexed to a new index `.snapshot-blob-cache-reindexed-for-9`. The code scheduling this clean up task is not able to locate the shard and would never trigger a clean up after the upgrade. This change uses the system index descriptor to find the matching shard and would work for future versions too. Closes elastic#120518
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Backports the following commits to 8.x: